CN116035523B

CN116035523B - Visual contrast sensitivity detection method and device and electronic equipment

Info

Publication number: CN116035523B
Application number: CN202310333434.2A
Authority: CN
Inventors: 邱启仓
Original assignee: Zhejiang Lab
Current assignee: Zhejiang Lab
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-06-16
Anticipated expiration: 2043-03-28
Also published as: CN116035523A

Abstract

The application provides a visual contrast sensitivity detection method, a visual contrast sensitivity detection device and electronic equipment. The method comprises the steps of obtaining a grating image of visual contrast sensitivity detection, so that the grating image is displayed through a display module; the grating image comprises M space frequencies, N contrast levels, grids corresponding to the M space frequencies and movable options corresponding to the M grids; the movable option is limited to changing the contrast level along the same spatial frequency; receiving a mobile operation of a tested person on a movable option; responding to the moving operation, generating a measuring result of the visual contrast sensitivity coarse screen, so that the contrast sensitivity of the current position of the movable option after moving in the measuring result of the visual contrast sensitivity coarse screen is displayed through a display module, and determining whether the contrast sensitivity is abnormal or not; under the condition of abnormal contrast sensitivity, visual contrast sensitivity fine screening is carried out by utilizing Gabor optotype with spatial frequency corresponding to the abnormal contrast sensitivity.

Description

Visual contrast sensitivity detection method and device and electronic equipment

Technical Field

The present invention relates to the field of visual contrast sensitivity technologies, and in particular, to a visual contrast sensitivity detection method, device, and electronic apparatus.

Background

In the method for measuring visual contrast sensitivity in the related art, a person to be measured needs to detect each Gabor spot in each spatial frequency. Because the continuous detection time for detecting the visual contrast sensitivity is too long, the testee needs to forcedly select the sighting target for a long time, so that inaccurate detection is easily caused by fatigue, and the time is wasted.

Disclosure of Invention

The application provides a visual contrast sensitivity detection method, a visual contrast sensitivity detection device and electronic equipment, which shorten detection time, improve detection efficiency and avoid inaccurate detection caused by fatigue.

The application provides a visual contrast sensitivity detection method, which comprises the following steps:

acquiring a grating image of visual contrast sensitivity detection so as to display the grating image through a display module; the grating image comprises M space frequencies, N contrast levels, grids corresponding to the M space frequencies and movable options corresponding to the M grids; the movable option is limited to changing contrast levels along the same spatial frequency;

receiving a mobile operation of the movable option by a tested person;

responding to the moving operation, generating a measurement result of a visual contrast sensitivity coarse screen, so that the measurement result of the visual contrast sensitivity coarse screen is displayed through the display module, wherein the measurement result of the visual contrast sensitivity coarse screen comprises the contrast sensitivity of the current position of the movable option after moving so as to determine whether the contrast sensitivity is abnormal;

Under the condition that the contrast sensitivity is abnormal, performing visual contrast sensitivity fine screening by using a Gabor visual target with a spatial frequency corresponding to the abnormal contrast sensitivity.

Further, under the condition that the contrast sensitivity is abnormal, performing visual contrast sensitivity fine screening by using a Gabor visual target with a spatial frequency corresponding to the abnormal contrast sensitivity, including:

receiving a starting operation of entering the visual contrast sensitivity fine screen input by a test responsible person; the starting operation of the visual contrast sensitivity fine screen is input when the test responsible personnel determines that the contrast sensitivity is abnormal;

responding to the starting operation, so that a Gabor visual target of the spatial frequency corresponding to the abnormal contrast sensitivity is displayed through a display module;

and (5) performing visual contrast sensitivity fine screening by using the corresponding Gabor optotype.

Further, the determining whether the contrast sensitivity is abnormal includes:

determining whether the contrast sensitivity is in a normal range of a contrast sensitivity threshold under a corresponding spatial frequency;

determining that the contrast sensitivity is abnormal under the condition that the contrast sensitivity is lower than a normal range of a contrast sensitivity threshold value under the corresponding spatial frequency;

And if the contrast sensitivity is within the normal range of the contrast sensitivity threshold value under the corresponding spatial frequency, determining that the contrast sensitivity is normal.

Further, the number of the spatial frequencies is 1 or more; the display module displays the Gabor optotype of the spatial frequency corresponding to the abnormal contrast sensitivity, including:

and sequentially displaying Gabor optotypes of the spatial frequencies corresponding to the abnormal contrast sensitivity according to the sequence of the spatial frequencies from low to high through the display module so as to determine whether the contrast sensitivity is abnormal.

Further, the displaying, by the display module, the Gabor optotype of the spatial frequency corresponding to the abnormal contrast sensitivity includes:

and randomly displaying a plurality of groups of Gabor targets through a display module, wherein each group of Gabor targets in the plurality of groups of Gabor targets comprises 3 Gabor targets with the same contrast sensitivity and in different directions.

Further, the visual contrast sensitivity detection method further comprises the following steps:

obtaining two paths of digital-to-analog conversion signals of video signals, wherein the video signals comprise video signals containing Gabor optotypes and/or video signals containing grating patterns, and the two paths of digital-to-analog conversion signals are R digital-to-analog conversion signals and G digital-to-analog conversion signals respectively;

Combining the R digital-to-analog conversion signal and the G digital-to-analog conversion signal to obtain a combined digital-to-analog conversion signal;

and according to the RGB color mode, dividing the combined digital-to-analog conversion signals into three paths of video signals and outputting the video signals to the display module.

Further, the display module includes a touchable display module, the movable options including slidable options;

the receiving testee performs a moving operation on the movable option, including:

receiving a sliding operation of the slidable option by the testee;

and generating a measurement result of the visual contrast sensitivity coarse screen in response to the moving operation, so that the measurement result of the visual contrast sensitivity coarse screen is displayed by the display module, including:

responding to the sliding operation, and generating a measurement result of the visual contrast sensitivity coarse screen so that the measurement result of the visual contrast sensitivity coarse screen is displayed through the display module; the measurement of the visual contrast sensitivity coarse screen includes a contrast sensitivity of a current position of the slidable option after sliding.

Further, the display module comprises a display module for inputting information through an external input device, and the movable options comprise draggable options;

receiving a drag operation of the testee on the draggable option;

responding to the dragging operation, and generating a measurement result of the visual contrast sensitivity coarse screen so that the measurement result of the visual contrast sensitivity coarse screen is displayed through the display module; the measurement result of the visual contrast sensitivity coarse screen comprises the contrast sensitivity of the current position of the draggable item after dragging.

Further, the M spatial frequencies include 6 spatial frequencies, the contrast level includes 10 contrast levels, a highest contrast level corresponds to a minimum sequence number, and a lowest contrast level corresponds to a maximum sequence number.

The application provides a visual contrast sensitivity detection device, include:

the grating image acquisition module is used for acquiring a grating image of the visual contrast sensitivity detection so as to display the grating image through the display module; the grating image comprises M space frequencies, N contrast levels, grids corresponding to the M space frequencies and movable options corresponding to the M grids; the movable option is limited to changing contrast level movements along the same spatial frequency;

The operation receiving module is used for receiving the mobile operation of the movable option by the testee;

an operation response module, configured to generate a measurement result of the visual contrast sensitivity coarse screen in response to the movement operation, so that the measurement result of the visual contrast sensitivity coarse screen is displayed by the display module, where the measurement result of the visual contrast sensitivity coarse screen includes contrast sensitivity of a current position of the movable item after movement, so as to determine whether the contrast sensitivity is abnormal;

the abnormality detection module is used for performing visual contrast sensitivity fine screening by utilizing the Gabor visual target with the spatial frequency corresponding to the abnormal contrast sensitivity under the condition that the contrast sensitivity is abnormal.

Further, the abnormality detection module is specifically configured to: receiving a starting operation of entering the visual contrast sensitivity fine screen input by a test responsible person; the starting operation of the visual contrast sensitivity fine screen is input when the test responsible personnel determines that the contrast sensitivity is abnormal; responding to the starting operation, so that a Gabor visual target of the spatial frequency corresponding to the abnormal contrast sensitivity is displayed through a display module;

Further, the visual contrast sensitivity detection device further comprises an abnormality determination module;

the anomaly determination module is configured to determine whether the contrast sensitivity is anomalous: determining whether the contrast sensitivity is in a normal range of a contrast sensitivity threshold under a corresponding spatial frequency; determining that the contrast sensitivity is abnormal under the condition that the contrast sensitivity is lower than a normal range of a contrast sensitivity threshold value under the corresponding spatial frequency; and if the contrast sensitivity is within the normal range of the contrast sensitivity threshold value under the corresponding spatial frequency, determining that the contrast sensitivity is normal.

Further, the number of the spatial frequencies is 1 or more;

the visual contrast sensitivity detection device also comprises a display module;

the display module is used for sequentially displaying Gabor optotypes of the spatial frequencies corresponding to the abnormal contrast sensitivity according to the sequence of the spatial frequencies from low to high so as to determine whether the contrast sensitivity is abnormal.

Further, the display module is specifically configured to randomly display multiple groups of Gabor targets, where each group of Gabor targets in the multiple groups of Gabor targets includes 3 Gabor targets with the same contrast sensitivity in different directions.

Further, the visual contrast sensitivity detection device further comprises a video signal conversion module;

the video signal conversion module is used for obtaining two paths of digital-to-analog conversion signals of video signals, wherein the video signals comprise video signals containing Gabor optotypes and/or video signals containing raster images, and the two paths of digital-to-analog conversion signals are R digital-to-analog conversion signals and G digital-to-analog conversion signals respectively; combining the R digital-to-analog conversion signal and the G digital-to-analog conversion signal to obtain a combined digital-to-analog conversion signal; and according to the RGB color mode, dividing the combined digital-to-analog conversion signals into three paths of video signals and outputting the video signals to the display module.

the operation receiving module is specifically configured to receive a sliding operation of the slidable option by the tested person;

the operation response module is specifically configured to respond to the sliding operation, and generate a measurement result of the visual contrast sensitivity coarse screen, so that the measurement result of the visual contrast sensitivity coarse screen is displayed through the display module; the measurement of the visual contrast sensitivity coarse screen includes a contrast sensitivity of a current position of the slidable option after sliding.

the operation receiving module is specifically configured to receive a drag operation of the drag option by the tested person;

the operation response module is specifically configured to respond to the drag operation, and generate a measurement result of the visual contrast sensitivity coarse screen, so that the measurement result of the visual contrast sensitivity coarse screen is displayed through the display module; the measurement result of the visual contrast sensitivity coarse screen comprises the contrast sensitivity of the current position of the draggable item after dragging.

The application provides an electronic device comprising the visual contrast sensitivity detection device.

There is provided a computer readable storage medium having stored thereon a program which, when executed by a processor, implements a method as claimed in any one of the preceding claims.

In some embodiments, the visual contrast sensitivity detection method of the present application obtains a raster image of visual contrast sensitivity detection, so that the raster image is displayed by the display module; the grating image comprises M space frequencies, N contrast levels, grids corresponding to the M space frequencies and movable options corresponding to the M grids; the movable option is limited to changing the contrast level along the same spatial frequency; receiving a mobile operation of a tested person on a movable option; responding to the moving operation, generating a measurement result of the visual contrast sensitivity coarse screen, so that the measurement result of the visual contrast sensitivity coarse screen is displayed through the display module, wherein the measurement result of the visual contrast sensitivity coarse screen comprises the contrast sensitivity of the current position of the movable option after moving so as to determine whether the contrast sensitivity is abnormal; under the condition of abnormal contrast sensitivity, visual contrast sensitivity fine screening is carried out by utilizing Gabor optotype with spatial frequency corresponding to the abnormal contrast sensitivity.

In the embodiment of the application, the visual contrast sensitivity coarse screening is performed through the grating image of the visual contrast sensitivity detection, the spatial frequency corresponding to the abnormal contrast sensitivity can be determined, the visual contrast sensitivity fine screening is performed only on Gabor targets of the spatial frequency corresponding to the abnormal contrast sensitivity value, the Gabor targets do not need to be compared one by one, the detection time is shortened, the detection efficiency is improved, and in addition, the detection inaccuracy caused by fatigue is avoided.

Drawings

FIG. 1 is a flow chart of a visual contrast sensitivity detection method according to an embodiment of the present application;

FIG. 2 is a diagram of a coarse screen of visual contrast sensitivity in the method for detecting visual contrast sensitivity according to the embodiment of the present application;

FIG. 3 is a schematic diagram showing the calculation of spatial frequency in the visual contrast sensitivity detection method according to the embodiment of the application;

FIG. 4 is a schematic diagram of a Gabor optotype of the visual contrast sensitivity detection method shown in FIG. 1;

FIG. 5 is a schematic diagram showing the video signal processing of the visual contrast sensitivity detection method shown in FIG. 1;

FIG. 6 is a schematic flow chart of a coarse screen of visual contrast sensitivity in the visual contrast sensitivity detection method shown in FIG. 1;

FIG. 7 is a flowchart showing a step 140 of the visual contrast sensitivity detection method shown in FIG. 1;

FIG. 8 is a flowchart showing a specific application of the visual contrast sensitivity detection method shown in FIG. 1;

FIG. 9 is a schematic block diagram of a visual contrast sensitivity detection device according to an embodiment of the disclosure;

FIG. 10 is a schematic diagram of the visual contrast sensitivity detection device shown in FIG. 9;

fig. 11 is a block diagram of an electronic device according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with one or more embodiments of the present specification. Rather, they are merely examples of apparatus and methods consistent with aspects of one or more embodiments of the present description as detailed in the accompanying claims.

It should be noted that: in other embodiments, the steps of the corresponding method are not necessarily performed in the order shown and described in this specification. In some other embodiments, the method may include more or fewer steps than described in this specification. Furthermore, individual steps described in this specification, in other embodiments, may be described as being split into multiple steps; while various steps described in this specification may be combined into a single step in other embodiments.

In order to solve the technical problems that detection is inaccurate and time-consuming due to fatigue, the embodiment of the application provides a visual contrast sensitivity detection method.

The method comprises the steps of obtaining a grating image of visual contrast sensitivity detection so as to enable the grating image to be displayed through a display module; the grating image comprises M space frequencies, N contrast levels, grids corresponding to the M space frequencies and movable options corresponding to the M grids; the movable option is limited to changing the contrast level along the same spatial frequency; receiving a mobile operation of a tested person on a movable option; responding to the moving operation, generating a measurement result of the visual contrast sensitivity coarse screen, so that the measurement result of the visual contrast sensitivity coarse screen is displayed through the display module, wherein the measurement result of the visual contrast sensitivity coarse screen comprises the contrast sensitivity of the current position of the movable option after moving so as to determine whether the contrast sensitivity is abnormal; under the condition of abnormal contrast sensitivity, visual contrast sensitivity fine screening is carried out by utilizing Gabor optotype with spatial frequency corresponding to the abnormal contrast sensitivity.

In the embodiment of the application, after responding to the moving operation and generating a measurement result of the visual contrast sensitivity coarse screen to determine whether the contrast sensitivity is abnormal, performing visual contrast sensitivity fine screen by using the Gabor visual target of the spatial frequency corresponding to the abnormal contrast sensitivity. Therefore, the visual contrast sensitivity coarse screening is performed through the grating diagram of the visual contrast sensitivity detection, the spatial frequency corresponding to the abnormal contrast sensitivity can be determined, the visual contrast sensitivity fine screening is performed only on Gabor targets with the spatial frequency corresponding to the abnormal contrast sensitivity, the Gabor targets do not need to be compared one by one, the detection time is shortened, the detection efficiency is improved, and in addition, inaccurate detection caused by fatigue is avoided. Meanwhile, the accuracy of detection can be improved through multiple detection of the detected person.

The visual contrast sensitivity detection method can be applied to electronic equipment. The electronic device may be, but is not limited to, a computer or a smart mobile device. Illustratively, a smart mobile device such as a handset. The electronic device may display information via the display module. The display module may be, but is not limited to being, a display screen. In response, the electronic device may include, but is not limited to, a host and a display screen. For example, the computer is a portable computer. The display module may be, but is not limited to being, a display, and may be, but is not limited to, a display that includes a host and is separate from the host. For example, the computer is a desktop computer.

The principle of the visual Contrast sensitivity detection method and device in the embodiment of the application is that the Contrast is determined by the brightness of an object and the brightness of a background, and a Contrast (Contrast) calculation formula is as follows:

wherein, the liquid crystal display device comprises a liquid crystal display device,

for the brightness of the brightest area in the image, +.>

Is the brightness of the darkest area in the image. Contrast sensitivity at a certain spatial frequency is defined as the inverse of the contrast threshold at that spatial frequency.

The contrast sensitivity can be expressed by the inverse of the image contrast value, and the lower the image contrast value, the higher the contrast sensitivity. Contrast sensitivity is the ability to evaluate the sharpness of objects of different contrast (ability to distinguish between gradation levels) under the same level of vision (typically the same spatial frequency). The spatial frequency of vision is a measure of the ability to see objects clearly at high contrast, and is evaluated at high contrast.

Fig. 1 is a flow chart of a visual contrast sensitivity detection method according to an embodiment of the application. Fig. 2 is a grating diagram used for coarse screening of visual contrast sensitivity in the visual contrast sensitivity detection method according to the embodiment of the application.

As shown in fig. 1 and 2, the visual contrast sensitivity detection method may include, but is not limited to, the following steps 110 to 140:

step 110, obtaining a grating image of visual contrast sensitivity detection so as to display the grating image through a display module; the grating image comprises M space frequencies, N contrast levels, grids corresponding to the M space frequencies and movable options corresponding to the M grids; the movable option is limited to changing the contrast level along the same spatial frequency. In this way, the movable option can be moved along the same spatial frequency changing contrast level.

In the raster pattern shown in fig. 2, the grid is a pair of black and white stripes with 100% black and white contrast. The gate is a pair of grey and white stripes with a black and white contrast of less than 100%. The contrast of 100% in black and white becomes smaller and the gray corresponding to the gate becomes gradually lighter.

The spatial frequencies represented by the different fringes are different. Fig. 3 is a schematic diagram illustrating calculation of spatial frequency in the visual contrast sensitivity detection method according to the embodiment of the application.

The above spatial frequency (spatial frequency) as shown in fig. 3 can be obtained by the following formula:

wherein d represents the distance between the human eye 21 of the subject and the grating pattern 22, i.e. the distance between the human eye 21 of the subject and the display module in the embodiment of the present application;

an angle indicating the human eye 21 of the subject and the grating in the grating pattern 22; r represents the number of gate cycles; h represents the width of the gate. Wherein, raster image 22 refers to a raster image. The gate also refers to a gate image.

M and N are 1 or more. The M spatial frequencies may include, but are not limited to, a plurality of spatial frequencies, such as 6 spatial frequencies to 9 spatial frequencies, and the contrast level includes a plurality of contrast levels, such as 5 contrast levels to 11 contrast levels.

In an embodiment, the M spatial frequencies may include, but are not limited to, 6 spatial frequencies, the contrast levels including 10 contrast levels, the highest contrast level corresponding to the smallest sequence number, and the lowest contrast level corresponding to the largest sequence number. The contrast is highest and the corresponding contrast sensitivity is lowest.

Fig. 4 is a schematic diagram of a Gabor optotype of the visual contrast sensitivity detection method shown in fig. 1.

In the example shown in fig. 4, 6 spatial frequencies may be, but are not limited to, A, B, C, D, E and F, respectively. Corresponding to the contrast levels, the contrast levels include contrast level 1, contrast level 2, contrast level 3, contrast level 4, contrast level 5, contrast level 6, contrast level 7, contrast level 8, contrast level 9, and contrast level 10.

Continuing with the illustration of fig. 4, the 6 spatial frequencies each have 10 contrast levels, and form 60 Gabor optotypes. The direction of the Gabor optotype is tilted left, right or up.

Example one: the 6 spatial frequencies are respectively 1.5c/d, 3c/d, 6c/d, 8c/d, 12c/d and 18c/d, the contrast level 1 is the highest level, and the contrast level 10 is the lowest level, so that the detection of visual contrast sensitivity is facilitated by using some common spatial frequencies.

Step 120, receiving the mobile operation of the movable option by the testee.

The subject is a user who needs to know his visual contrast sensitivity.

In response to the moving operation, a measurement result of the visual contrast sensitivity coarse screen is generated such that the measurement result of the visual contrast sensitivity coarse screen is displayed by the display module, the measurement result of the visual contrast sensitivity coarse screen including a contrast sensitivity of the current position of the movable item after the movement to determine whether the contrast sensitivity is abnormal.

The contrast sensitivity is determined by the contrast values in fig. 2 and 4. Specifically, the contrast value is obtained by the movement operation of the movable option by the testee, so that the contrast sensitivity threshold is obtained by the reciprocal of the contrast value. Thus, the visual function of a contrast sensitivity of the human eye is measured by the inverse of the contrast, and the sharpness of the surroundings is seen.

The current position is a position corresponding to the highest contrast ratio of the gate that can be observed by the subject. The measurement results of the visual contrast sensitivity coarse screen described above may include, but are not limited to, a graph including the measurement results of the visual contrast sensitivity coarse screen.

Coarse screening of contrast sensitivity detection in the visual contrast sensitivity detection method can be achieved through the

steps

110 and 130. Therefore, the spatial frequency or the spatial frequency of the testee and the contrast sensitivity corresponding to the contrast level or the contrast level of the testee can be timely mastered, and the follow-up continuous fine screening of the contrast sensitivity detection on the spatial frequency or the spatial frequency and the contrast level or the contrast level can be realized, so that the accuracy is ensured, and the speed is higher.

The determination of whether the contrast sensitivity is abnormal in step 130 may be performed by a local determination of whether the contrast sensitivity is abnormal. Of course, the determination of whether the contrast sensitivity is abnormal in step 130 above may be assisted by a test responsible person. The test responsible person may be a doctor or professional grasping knowledge of visual contrast sensitivity detection.

And 140, under the condition of abnormal contrast sensitivity, performing visual contrast sensitivity fine screening by using the Gabor optotype with the spatial frequency corresponding to the abnormal contrast sensitivity. The contrast sensitivity is abnormal, and the abnormal contrast sensitivity is corresponding.

The visual contrast sensitivity fine screening can be realized by utilizing the Gabor optotype with the spatial frequency corresponding to the abnormal contrast sensitivity. The coarse screen and the fine screen herein described above are contrast sensitivity thresholds at certain spatial frequencies.

Thus, whether the contrast sensitivity is normal or not is detected under the same spatial frequency, and the contrast sensitivity threshold corresponding to each spatial frequency falls in the gray area and is judged to be normal, so that the more the level is, the more the spatial frequency is subdivided, and the higher the measurement accuracy is.

Fig. 5 is a schematic diagram of video signal processing of the visual contrast sensitivity detection method shown in fig. 1.

As shown in fig. 5, the visual contrast sensitivity detection method further includes the steps of (1) to (3) below in the above-mentioned modulation process of the Gabor optotype and the grating pattern:

(1) And acquiring two paths of digital-to-analog conversion signals of the video signals, wherein the video signals comprise video signals containing Gabor optotypes and/or video signals containing raster images, and the two paths of digital-to-analog conversion signals are R digital-to-analog conversion signals and G digital-to-analog conversion signals respectively. In response to the fact that the other signal does not participate in output, the common RGB display can be switched to black-and-white signal display as one mode switching trigger signal.

The video signal refers to an image of each frame of the video signal input to the display by the host, and in the embodiment of the present application, the video signal includes a raster image in coarse screening and a Gabor optotype in fine screening.

(2) The R digital-to-analog conversion signal and the G digital-to-analog conversion signal are combined to obtain a combined digital-to-analog conversion signal 31.

At this time, when the voltage of any digital-to-analog conversion signal DAC changes, the voltage value of the combined digital-to-analog conversion signal DAC can be changed. The combined digital-to-analog conversion signal 31 is then split into three video signals of equal red, green and blue RGB, which are respectively delivered to the red, green and blue RGB of the display input signal. Since the voltage values of the three equal video signals are equal at this time, the output as a gray image signal can be ensured.

(3) The combined digital-to-analog conversion signal 31 is split into three video signals according to the RGB color mode and output to the display module.

Continuing with fig. 5, after the local video signal is input, the video signal is output to the display through the steps (1) to (3) described above. Further, the output of the digital-to-analog conversion module (Digital to Analog Converter, abbreviated as DAC) to the display module includes a video signal of the Gabor optotype, so as to display the Gabor optotype with a spatial frequency corresponding to the abnormal contrast sensitivity, and perform the visual contrast sensitivity fine screening. And, the output of the digital-to-analog conversion module DAC to the display module contains the video signal of the raster pattern, so as to display the raster pattern through the display module. The video signal containing the Gabor optotype and the video signal containing the raster image are gray scale images, and after the signals are transmitted to the display module, the display module can display corresponding images.

Compared with the related art 2 ⁸ The number of gray levels is too small to meet accurate contrast sensitivity measurements. In the embodiment of the present application, the two signals, i.e., the R digital-to-analog conversion signal and the G digital-to-analog conversion signal, are combined into a combined digital-to-analog conversion signal 31, and then the combined digital-to-analog conversion signal 31 is converted from 2 ⁸ The gray levels can be raised to approximately high brightness level 2 ⁸

2 ⁸ Can display more gradation levels. And, divide the digital-to-analog conversion signal 31 that is merged into three video signals of red, green and blue three routes, the subsequent video signal through control red, green and blue three routes realizes displaying on the display module.

For example, the light gray level difference may not be displayed, but may be replaced with other gray, compared to the related art, which may only display light gray and dark gray, resulting in deviation of the detection result. The Gabor optotype of the embodiments of the present application shows more gray level differences. The gray level differences such as gray have light gray, medium gray, dark gray, etc. And are not exemplified here. Thus, the larger the gray scale range is, the more gray scale values are, the more accurate the gray scale displayed in comparison with the gray scale displayed in the related art is, and the accuracy of the detection result is further improved.

Fig. 6 is a schematic flow chart of a coarse screen of visual contrast sensitivity in the visual contrast sensitivity detection method shown in fig. 1.

As shown in fig. 6, the display module may be, but is not limited to being, a touchable display module, and the movable option may be, but is not limited to being, a slidable option. In some embodiments, the step 120 is performed by moving the movable item, and the receiving person performs a sliding operation on the movable item. In response to the sliding operation, the step 130 may further include generating a measurement result of the visual contrast sensitivity coarse screen such that the measurement result of the visual contrast sensitivity coarse screen is displayed by the display module; the measurement of the visual contrast sensitivity coarse screen includes the contrast sensitivity of the current position of the slidable option after sliding. Therefore, the direct touch operation of the tested person is facilitated, and convenience is provided for the tested person.

In the embodiment shown in fig. 6, the touchable display module described above may be, but is not limited to being, a touchable display screen. The slidable option slides up and down along the same spatial frequency to change the contrast level so as to facilitate the up and down sliding of the tested person. Illustratively, the slidable option may be, but is not limited to, a slider.

Continuing with the illustration of fig. 6, the movable option is used to facilitate operation by the subject. The movable option is an operable block in any shape and any color, and the color of the movable option is distinguished from the color of the raster pattern. For example, the shape may be circular, elliptical or square. For another example, the colors are green, yellow, red, and the like. The above-exemplified shapes and colors may be used in combination. In the example shown in fig. 6, the movable option may be a red circular movable option, the red color is striking, and the circular shape is more convenient for the user to operate. In this way, the testee can select the contrast value at the 8 spatial frequencies by observing the red round movable option in the display module according to the 6 spatial frequencies, namely, the highest contrast of the grid can be observed by the testee at the 8 spatial frequencies.

The combined display module may be, but is not limited to, a display module for inputting information via an external input device, and the movable option may be, but is not limited to, a draggable option. In another embodiment of the above-mentioned moving operation of the movable option in step 120, the drag operation of the draggable option by the testee is received; correspondingly, the step 130 may further include generating a measurement result of the visual contrast sensitivity coarse screen in response to the drag operation, so that the measurement result of the visual contrast sensitivity coarse screen is displayed through the display module; the measurement of the visual contrast sensitivity coarse screen includes the contrast sensitivity of the current position of the draggable item after dragging. Therefore, the method can be suitable for various display modules, and the universality of application scenes is improved.

The display module may be, but not limited to, a display or a non-touchable display screen. The draggable options drag along the same spatial frequency up and down to change the contrast level, so as to facilitate the up and down drag of the tested person. Illustratively, the draggable option may be, but is not limited to, a drag block.

In connection with the coarse screen illustrated in fig. 6, a graph of the measurement results of the visual contrast sensitivity coarse screen generated in step 130 is described. If the requirement for further detection of one or more spatial frequencies is determined according to the graph of the measurement result of the visual contrast sensitivity coarse screen, performing more accurate fine screening in the following steps to determine an accurate contrast sensitivity threshold; if no fine screening is required, the detection is ended. Of course, the above-mentioned process of determining whether the contrast sensitivity is abnormal in step 130 may be performed with assistance of a test responsible person, or may be implemented automatically. The details are as follows.

In some embodiments of determining whether contrast sensitivity is abnormal in step 130 above, it may be helpful to test responsible personnel to determine whether fine screening is required. The gray-meshed region in the bottom graph of fig. 6, corresponding to the normal range of contrast sensitivity thresholds for the corresponding spatial frequencies, also indicates that the contrast sensitivity of the subject at these spatial frequencies is normal. If the test responsible person determines that the contrast sensitivity is abnormal, the following step 141 in fig. 7 is executed, and if the test responsible person determines that the contrast sensitivity is all normal, the flow is ended or the next person to be tested waits for continuing the visual contrast sensitivity detection.

In other embodiments of determining whether the contrast sensitivity is abnormal in the above step 130, the method may further include the following steps of < 1 > to < 3 >:

< 1 >, determining whether the contrast sensitivity is in the normal range of the contrast sensitivity threshold at the corresponding spatial frequency.

< 2 >, and determining that the contrast sensitivity is abnormal in the case that the contrast sensitivity is lower than the normal range of the contrast sensitivity threshold value at the corresponding spatial frequency.

< 3 >, and if the contrast sensitivity is within the normal range of the contrast sensitivity threshold at the corresponding spatial frequency, then determining that the contrast sensitivity is normal.

Fig. 7 is a specific flowchart illustrating step 140 of the visual contrast sensitivity detection method shown in fig. 1.

In some embodiments of the visual contrast sensitivity fine screen as shown in fig. 7, the following steps 141 to 143 may be included:

step 141, receiving a start operation of entering the visual contrast sensitivity fine screen input by a test responsible person; the starting operation of the visual contrast sensitivity fine screen is input when the test responsible personnel determines that the contrast sensitivity value is abnormal. Step 141 further includes receiving an account number input by a test responsible person, and logging in a start operation entered by the visual contrast sensitivity fine screening module; the starting operation of the visual contrast sensitivity fine screen is started when the test responsible person determines that the contrast sensitivity is abnormal.

The start operation, such as the display module has a start button, which is clicked by the test responsible person, and the start operation is available in step 141.

In step 142, in response to the start operation, the Gabor optotype of the spatial frequency corresponding to the abnormal contrast sensitivity is displayed by the display module.

The number of the above spatial frequencies may be 1 or more. The step 142 may further include sequentially displaying, by the display module, gabor optotypes of spatial frequencies corresponding to abnormal contrast sensitivities in order of the spatial frequencies from low to high, when the number of spatial frequencies is greater than 1, to further measure and determine whether the contrast sensitivities are abnormal, so as to determine whether the contrast sensitivities are abnormal.

The step 142 may further include randomly displaying a plurality of groups of Gabor targets through the display module, wherein each group of Gabor targets includes 3 Gabor targets with different directions with the same contrast sensitivity, so that the testee determines the direction of the middle Gabor target. For example, randomly displaying multiple groups of Gabor targets may include displaying one Gabor target at a time, multiple times. Or randomly displaying multiple groups of Gabor targets can comprise displaying multiple Gabor targets at a time, and a tested person judges the direction of the middle Gabor target, and the left Gabor target and the right Gabor target can be used as interference Gabor targets. Thus, the effectiveness of the detection of the subject can be improved.

And step 143, performing visual contrast sensitivity fine screening by using the corresponding Gabor optotype. Thus, the contrast sensitivity result after visual contrast sensitivity fine screening can be obtained. And, the contrast sensitivity result after the visual contrast sensitivity fine screening may also include a graph of the contrast sensitivity result after the visual contrast sensitivity fine screening. Therefore, the testing responsible personnel assist in entering the fine screening, so that more accurate fine screening is finished, and the accuracy of visual contrast sensitivity detection is improved.

Fig. 8 is a flowchart illustrating a specific application of the visual contrast sensitivity detection method shown in fig. 1.

As shown in fig. 8, a display module is taken as a display, and a circular red slider is taken as a movable option.

Step one: a visual contrast sensitivity detection program (APP) is turned on.

Step two: when the detection is started, the display enters a visual contrast sensitivity coarse screen interface, and a grating diagram and circular red sliders at 8 spatial frequencies are displayed.

Step three: the circular red slider is slid up and down. Specifically, the testee needs to slide each circular red slider up and down to the highest contrast limit of the grating observed under the corresponding spatial frequency, namely the contrast sensitivity threshold under the spatial frequency.

Step four: after each circular red slider is slid, a measurement result of the visual contrast sensitivity coarse screen is generated.

Step five: the test responsible personnel judges whether to enter the visual contrast sensitivity fine screening. If not, the contrast sensitivity of the tested person is normal, and the detection is finished. If so, step six is performed.

Step six, selecting the spatial frequency needing visual contrast sensitivity fine screening in the display by a testing responsible person, storing the required spatial frequency and the visual contrast sensitivity coarse screening contrast sensitivity threshold value of the tested person in the spatial frequency, and entering a step seven.

When the testee slides the circular red slide blocks of each spatial frequency until the testee cannot see the fuzzy and clear limit on the spatial frequency, the ordinate where the circular red slide blocks are located is the contrast sensitivity threshold of the testee under the spatial frequency. After all the round red sliding blocks slide down the contrast sensitivity threshold of the tested person, a doctor judges whether to enter the visual contrast sensitivity fine screening.

Step seven: the display enters a visual contrast sensitivity fine screening interface.

And step eight, acquiring the spatial frequency and the corresponding contrast sensitivity threshold, wherein the contents are saved in step six. If the number of the spatial frequencies is greater than 1, the contrast sensitivity threshold detection is sequentially carried out according to the order of the spatial frequencies from small to large.

And step nine, determining a contrast sensitivity threshold of the tested person under the spatial frequency by adopting a three-in-one-out method. Specifically, the visual contrast sensitivity fine screening starts from a contrast level lower than the level of the visual contrast sensitivity coarse screening contrast sensitivity threshold value, and a three-in-one-out method is adopted to determine the visual contrast sensitivity fine screening contrast sensitivity threshold value of the tested person under the spatial frequency.

And step ten, generating a contrast sensitivity result after visual contrast sensitivity fine screening, wherein the contrast sensitivity result after visual contrast sensitivity fine screening is a graph of the contrast sensitivity result after visual contrast sensitivity fine screening.

Further, the three-in-one-out method starts the test from the contrast level lower than the level of the visual contrast sensitivity coarse screening contrast sensitivity threshold in the designated spatial frequency. The display has 3 laterally arranged Gabor targets in different directions randomly, wherein the left and right Gabor targets are interference, and a tested person needs to judge the directions of the middle Gabor targets. If the direction is continuously judged to be correct three times in the Gabor optotype with the same contrast, one contrast grade is increased; if it is determined that the orientation of the Gabor optotype is wrong once, the contrast level is lowered by one. And stopping visual contrast sensitivity detection when the testee judges correctly and judges incorrectly repeatedly twice between the two contrast grades, taking the contrast at the last judgment, and determining the visual contrast sensitivity fine screening contrast sensitivity threshold value under the spatial frequency.

Fig. 9 is a schematic block diagram of a visual contrast sensitivity detection device according to an embodiment of the disclosure. Fig. 10 is a schematic structural diagram of the visual contrast sensitivity detection device shown in fig. 9.

As shown in fig. 9 and 10, the visual contrast sensitivity detection device includes, but is not limited to, the following modules:

a raster image acquisition module 41 for acquiring a raster image of visual contrast sensitivity detection so that the raster image is displayed by the display module; the grating image comprises M space frequencies, N contrast levels, grids corresponding to the M space frequencies and movable options corresponding to the M grids; the movable option is limited to changing contrast level movements along the same spatial frequency;

An operation receiving module 42, configured to receive a movement operation of the movable option by the testee;

an operation response module 43 for responding to the moving operation, generating a measurement result of the visual contrast sensitivity coarse screen, so that the measurement result of the visual contrast sensitivity coarse screen is displayed by the display module, and the measurement result of the visual contrast sensitivity coarse screen comprises the contrast sensitivity of the current position of the movable option after moving, so as to determine whether the contrast sensitivity is abnormal;

the anomaly detection module 44 is configured to perform visual contrast sensitivity fine screening by using the Gabor optotype with the spatial frequency corresponding to the abnormal contrast sensitivity in the case that the contrast sensitivity is abnormal.

In some embodiments, anomaly detection module 44 is specifically configured to: receiving a starting operation of entering the visual contrast sensitivity fine screen input by a test responsible person; the starting operation of the visual contrast sensitivity fine screening is input when a person in charge of testing determines that the contrast sensitivity is abnormal; responding to the starting operation so as to enable the display module to display the Gabor optotype of the spatial frequency corresponding to the abnormal contrast sensitivity;

In some embodiments, the visual contrast sensitivity detection apparatus further comprises an anomaly determination module;

An anomaly determination module for determining whether the contrast sensitivity is anomalous: determining whether the contrast sensitivity is in a normal range of a contrast sensitivity threshold under the corresponding spatial frequency; under the condition that the contrast sensitivity is lower than the normal range of the contrast sensitivity threshold value under the corresponding spatial frequency, determining that the contrast sensitivity is abnormal; and under the condition that the contrast sensitivity is in the normal range of the contrast sensitivity threshold value under the corresponding spatial frequency, determining that the contrast sensitivity is normal.

In some embodiments, the number of spatial frequencies is 1 or more. The visual contrast sensitivity detection device also comprises a display module;

and the display module is used for sequentially displaying Gabor optotypes of the spatial frequencies corresponding to the abnormal contrast sensitivity according to the sequence from low spatial frequencies to high spatial frequencies under the condition that the number of the spatial frequencies is larger than 1 so as to further measure and determine whether the contrast sensitivity is abnormal or not so as to determine whether the contrast sensitivity is abnormal or not.

In some embodiments, the display module is specifically configured to randomly display a plurality of groups of Gabor targets, where each group of Gabor targets includes 3 Gabor targets with different directions of the same contrast sensitivity, so that the testee determines the direction of the middle Gabor target.

In some embodiments, the visual contrast sensitivity detection apparatus further comprises a video signal conversion module;

the video signal conversion module is used for obtaining two paths of digital-to-analog conversion signals of video signals, wherein the video signals comprise video signals containing Gabor optotypes and/or video signals containing grating patterns, and the two paths of digital-to-analog conversion signals are R digital-to-analog conversion signals and G digital-to-analog conversion signals respectively; combining the R digital-to-analog conversion signal and the G digital-to-analog conversion signal to obtain a combined digital-to-analog conversion signal; and dividing the combined digital-to-analog conversion signals into three paths of video signals according to the RGB color mode, and outputting the video signals to a display module.

Continuing with fig. 10, the computer PC (Personal Computer ) includes a graphics card and a host computer. The video signal conversion module may be, but is not limited to, a graphics card. The software of the host computer of the PC obtains two paths of digital-to-analog conversion signals of the video signal, the two paths of digital-to-analog conversion signals of the video signal are transmitted to the display card, and the display card transmits the two paths of digital-to-analog conversion signals to the display after passing through the steps (1) to (3).

In some embodiments, the display module comprises a touchable display module, and the movable option comprises a slidable option;

an operation receiving module 42, specifically configured to receive a sliding operation performed by the testee on the slidable option;

An operation response module 43, specifically configured to generate a measurement result of the visual contrast sensitivity coarse screen in response to the sliding operation, so that the measurement result of the visual contrast sensitivity coarse screen is displayed by the display module; the measurement of the visual contrast sensitivity coarse screen includes the contrast sensitivity of the current position of the slidable option after sliding.

In some embodiments, the display module includes a display module that inputs information via an external input device, and the movable options include draggable options;

the operation receiving module 42 is specifically configured to receive a drag operation of the drag option by the testee;

the operation response module 43 is specifically configured to generate a measurement result of the visual contrast sensitivity coarse screen in response to the drag operation, so that the measurement result of the visual contrast sensitivity coarse screen is displayed by the display module; the measurement of the visual contrast sensitivity coarse screen includes the contrast sensitivity of the current position of the draggable item after dragging.

The implementation process of the functions and roles of each module/sub-module/unit in the above device is specifically detailed in the implementation process of the corresponding steps in the above method, and will not be described herein again.

The embodiment of the application provides electronic equipment, which comprises the visual contrast sensitivity detection device.

As shown in fig. 11, the electronic device 50 includes one or more processors 51 for implementing the visual contrast sensitivity detection method as described above.

In some embodiments, the electronic device 50 may include a storage medium 59, and the storage medium 59 may store programs that may be called by the processor 51 and may include a non-volatile storage medium. In some embodiments, electronic device 50 may include memory 58 and interface 57. In some embodiments, electronic device 50 may also include other hardware depending on the actual application.

The storage medium 59 of the embodiment of the present application has stored thereon a program for implementing the visual contrast sensitivity detection method as described above when executed by the processor 51.

The present application may take the form of a computer program product embodied on one or more storage media 59 (including but not limited to disk storage, CD-ROM, optical storage, etc.) having program code embodied therein. Storage media 59 includes both permanent and non-permanent, removable and non-removable media, and may be any method or technology for storage of information. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media 59 include, but are not limited to: phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, may be used to store information that may be accessed by the computing device.

In the description of the present application, it should be understood that the terms "middle," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

The foregoing description of the preferred embodiments is provided for the purpose of illustration only, and is not intended to limit the scope of the disclosure, since any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the disclosure are intended to be included within the scope of the disclosure.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the phrase "comprising one … …" does not exclude the presence of additional identical elements in a process, method, article, or apparatus that comprises the depicted element.

Claims

1. A visual contrast sensitivity detection method, comprising:

receiving a mobile operation of the movable option by a tested person;

responding to the starting operation, so that Gabor optotypes of the spatial frequencies corresponding to the abnormal contrast sensitivity are sequentially displayed through the display module according to the sequence from low spatial frequency to high spatial frequency, and whether the contrast sensitivity is abnormal or not is determined; the number of the spatial frequencies is greater than or equal to 1; the Gabor optotypes comprise a plurality of Gabor optotypes with each spatial frequency, and the Gabor optotypes with one spatial frequency are a group of Gabor optotypes; the Gabor optotypes comprise a plurality of groups of Gabor optotypes; each group of Gabor targets in the plurality of groups of Gabor targets comprises Gabor targets in 3 different directions with the same contrast sensitivity; the Gabor optotype has 3 different directions of tilting leftwards, tilting rightwards and tilting upwards respectively; the Gabor optotypes of each group of Gabor optotypes are randomly displayed;

2. The visual contrast sensitivity detection method according to claim 1, wherein the determining whether the contrast sensitivity is abnormal comprises:

3. The visual contrast sensitivity detection method according to claim 1, wherein the visual contrast sensitivity detection method further comprises:

4. The visual contrast sensitivity detection method of claim 1, wherein the display module comprises a touchable display module, the movable option comprising a slidable option;

receiving a sliding operation of the slidable option by the testee;

5. The visual contrast sensitivity detection method of claim 1, wherein the display module comprises a display module for inputting information via an external input device, the movable option comprises a draggable option;

receiving a drag operation of the testee on the draggable option;

6. The visual contrast sensitivity detection method of claim 1, wherein the M spatial frequencies comprise 6 spatial frequencies, the contrast level comprises 10 contrast levels, a highest contrast level corresponds to a minimum sequence number, and a lowest contrast level corresponds to a maximum sequence number.

7. A visual contrast sensitivity detection device, characterized by comprising:

the abnormality detection module is used for performing visual contrast sensitivity fine screening by utilizing Gabor optotype with spatial frequency corresponding to abnormal contrast sensitivity under the condition that the contrast sensitivity is abnormal;

the abnormality detection module is specifically configured to: receiving a starting operation of entering the visual contrast sensitivity fine screen input by a test responsible person; the starting operation of the visual contrast sensitivity fine screen is input when the test responsible personnel determines that the contrast sensitivity is abnormal; responding to the starting operation, so that a Gabor visual target of the spatial frequency corresponding to the abnormal contrast sensitivity is displayed through a display module; performing visual contrast sensitivity fine screening by using the corresponding Gabor optotype; the number of the spatial frequencies is greater than or equal to 1;

the display module is used for sequentially displaying Gabor optotypes of the spatial frequencies corresponding to the abnormal contrast sensitivity according to the sequence from low spatial frequencies to high spatial frequencies so as to determine whether the contrast sensitivity is abnormal; the Gabor optotypes comprise a plurality of Gabor optotypes with each spatial frequency, and the Gabor optotypes with one spatial frequency are a group of Gabor optotypes; the Gabor optotypes comprise a plurality of groups of Gabor optotypes; each group of Gabor targets in the plurality of groups of Gabor targets comprises Gabor targets in 3 different directions with the same contrast sensitivity; the Gabor optotype has 3 different directions of tilting leftwards, tilting rightwards and tilting upwards respectively; the plurality of Gabor optotypes of each group of Gabor optotypes are randomly displayed.

8. The visual contrast sensitivity detection apparatus as set forth in claim 7, wherein the visual contrast sensitivity detection apparatus further comprises an abnormality determination module;

9. The visual contrast sensitivity detection apparatus as set forth in claim 7, wherein the visual contrast sensitivity detection apparatus further comprises a video signal conversion module;

10. The visual contrast sensitivity detection apparatus of claim 7, wherein the display module comprises a touchable display module, the movable option comprising a slidable option;

11. The visual contrast sensitivity detection apparatus of claim 7, wherein the display module comprises a display module for inputting information via an external input device, the movable option comprising a draggable option;

12. An electronic device comprising a visual contrast sensitivity detection apparatus according to any one of claims 7 to 11.